I'm on the edge of not being able to fit on Astro Orbiter (5-foot-10, anywhere from 350-375 depending on how my most recent dieting attempt has gone), and I usually end up skipping it because it's not worth the wait for the ride for the struggle of fitting. That said, I do fit, and my tips for Pooh-sized people riding would be:
- Try to ride solo if you can. A Pooh-sized person with a normal sized person makes for a tight squeeze (and two pooh-sized people is... let's just say not great...)
- Pull the seatbelt out and flip it over the side of the rocket before you get in. It's easier to grab it this way than to try to dig it out once you're in there.
- As multiple people have mentioned, when you're getting out, push up from both sides, then stand in the middle, then exit the rocket.
During the ride itself, the rocket doesn't actual feel THAT bad. It's really just the entry/exit process that aren't Pooh-friendly.